Package org.datanucleus.store.query

Class JDOQLSingleStringParser

java.lang.Object

org.datanucleus.store.query.JDOQLSingleStringParser

public class JDOQLSingleStringParser
extends Object

Parser for handling JDOQL Single-String queries. Takes a JDOQLQuery and the query string and parses it into its constituent parts, updating the JDOQLQuery accordingly with the result that after calling the parse() method the JDOQLQuery is populated.

 select [unique] [{result}] [into {result-class-name}]
                              [from {candidate-class-name} [exclude subclasses] ]
                              [where {filter}]
                              [variables {variables-clause} ]
                              [parameters {parameters-clause} ]
                              [{imports-clause}]
                              [group by {grouping-clause} ]
                              [order by {ordering-clause} ]
                              [range {from-range} ,{to-range}]                                       
 

or

 UPDATE {candidate-class-name} SET fld1 = val[, fld2 = val2] WHERE {filter}
 

or

 DELETE FROM {candidate-class-name} [exclude-subclasses] WHERE {filter}
 

Note that {filter} can contain subqueries, hence containing keywords

 SELECT c FROM Customer c WHERE timeAvailable < (SELECT avg(hours) FROM Employee e)
 

So the "filter" for the outer query is "timeAvailable < (SELECT avg(hours) FROM Employee e)"

Constructor Summary

Constructors

Constructor	Description
JDOQLSingleStringParser(Query query, String queryString)	Constructor for the Single-String parser.

Method Summary

Modifier and Type	Method	Description
void	parse()	Method to parse the Single-String query
void	setAllowDelete(boolean allow)
void	setAllowUpdate(boolean allow)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JDOQLSingleStringParser

public JDOQLSingleStringParser(Query query,
                               String queryString)

Constructor for the Single-String parser.

Parameters:

query - The query

queryString - The Single-String query

Method Detail

setAllowDelete

public void setAllowDelete(boolean allow)

setAllowUpdate

public void setAllowUpdate(boolean allow)

parse

public void parse()

Method to parse the Single-String query